JPH05193733A - Device for successive transmission and loading of powdery grain - Google Patents

Abstract

(57) [Summary] (Correction) [Constitution] In a continuous conveying and loading device for powder and granular material, centering around a material receiving mechanism and a vertical axis that is enclosed in the material receiving mechanism and extends upward. A rotating screw conveyor (first vertical conveyor) 1 is provided, which is a belt conveyor (second vertical conveyor) which is arranged vertically to the loading device and has a material receiving chamber 8. The powder and granules are supplied by an almost horizontal free flying jet. By the combination according to the invention of a first vertical conveyor incorporating a material receiving mechanism and a second vertical conveyor configured as a bucket conveyor, a significant weight savings is achieved in the construction of a continuous transport loader. As a result, structural simplifications can be made and the relative feed to weight of the improved device can be increased compared to known feed material feed from a material receiving mechanism to a vertical conveyor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material receiving mechanism which rotates about a vertical axis, and a screw conveyor which is enclosed in the material receiving mechanism and extends upward and rotates about the same vertical axis. (First vertical conveyor), which is a belt conveyor (secondary conveyor) which is arranged vertically to the loading device and has a material receiving chamber.
Vertical conveyor) for powder and granules in a substantially horizontal free-spraying jet, for continuous transport and loading equipment for powder and granules.

[0002]

2. Description of the Prior Art At the lower end of the loader is a known material receiving mechanism in the form of a digging head which rotates about a vertical axis or a bucket wheel with one or more buckets or cutting strips. The material receiving mechanism feeds the conveyed material radially inwardly to a first vertical conveyor, which is enclosed in the lower area by a digging head or bucket car. This first vertical conveyor is a screw conveyor.

The first conveyor preferably comprises a double-threaded screw and a tube tightly surrounding the screw. Due to the high rotation speed of the screw, the granular material that has entered the screw lead is pressed against the inner wall of the pipe. Due to the friction against the inner wall of the pipe, the granular material is pushed upward against the pitch of the screw.

As soon as the powder particles reach the opening provided in the tube further upward, they immediately leave the screw tangentially by centrifugal force.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a first screw conveyor (first vertical conveyor) having a material receiving mechanism to a belt conveyor (second vertical conveyor) having a material receiving chamber. Supply the powder and granules to this second
It is to provide a device in which the most efficient filling of a vertical conveyor of

[0006]

According to the invention, the object is to provide a transition with a square cross section between the outlet in the screw tube of the first vertical conveyor and the inlet in the second vertical conveyor. The passage is arranged at a constant height, the width of the transition passage and the inlet being limited by the tangent line of the screw tube and an imaginary circle whose diameter reaches 80 to 90% of the inner diameter of the screw tube, It is solved by the fact that the material receiving chambers of the two vertical conveyors have a width determined by the spacing of the tangent hit points at the innermost of these chambers.

The opening in the tube at the top of the first vertical conveyor is formed so that the granules are accurately and completely discharged from the first vertical conveyor into the area of the upward moving chamber of the second vertical conveyor. To be done.

Due to the combination according to the invention of a first vertical conveyor incorporating a material receiving mechanism and a second vertical conveyor configured as a bucket conveyor, a significant weight saving is achieved in the construction of a continuous transport loader. As a result, structural simplifications can be made and the relative feed to weight of the improved device can be increased compared to known feed material feed from a material receiving mechanism to a vertical conveyor.

In the screw tube, the particles have a smaller vertical velocity component and a larger peripheral velocity. Therefore, when the granules reach the opening, they flow out a little (about 10 °) upwards at the resulting velocity.

The granules which have not yet reached the opening as they pass through the opening are again pressed against the inner wall of the tube, and once again move around in the inner wall of the tube in a spiral fashion, and then flow out from the higher part of the opening.

By the width and position of the opening, it is possible to determine the width and the outflow direction of the granular material jet which spreads in a fan shape. The height of the openings must be chosen at least so that all granules can exit the screen.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings.

It is assumed that the basic construction of a continuous carrier ship unloading device for powder and granules is known. Therefore, the illustration of the entire unloading device can be omitted.

It is assumed that the vertical conveyor 1 is constructed as a screw conveyor in the so-called unloading nasal projection of the ship unloading device. This screw conveyor has a material receiving mechanism 1 that rotates around a vertical axis.
a, for example a drilling head, is supplied with powder.

The granules are fed radially inward by the excavation head 1a to the first vertical conveyor. A screw shaft 4 is arranged in the screw tube 3 of the first vertical conveyor 1, and this screw shaft preferably has two screw leads. The drive of the screw shaft 4 is arranged above the transition passage 6 to the second vertical conveyor 2.

According to FIG. 1, the granules 13 exit the first vertical conveyor 1 through an outlet 5 provided in the upper part of the screw tube 3 and pass through a transition passage 6 in a substantially tangential direction. It is discharged into the area of the upwardly moving material receiving chamber bottom 8 of the second vertical conveyor 2.

The second vertical conveyor 2 comprises a flat support belt 11. The support belt 11 can be made of, for example, rubber or a woven fabric having a particularly high tensile strength in the longitudinal direction of the belt, in which a portion for transmitting a tensile force is embedded, such as steel or plastic rope. The material receiving chamber bottoms 8 are attached to the support belt 11 at regular intervals at right angles to the moving direction, and these material receiving chamber bottoms together with the material receiving chamber side walls 9 form a material receiving chamber. The material receiving chamber bottom 8, which can be formed exchangeably (not shown), is designed to be protected against wear.

The material receiving chamber side walls 9 are known corrugated edges or flanks on the side of each bottom 8, which are not connected to the support belt 11 and which run through deflection rollers or arcs. The support belt is given the freedom of movement necessary at that time.

The particles are freely scattered in a substantially horizontal direction from the upper side opening of the first vertical conveyor 1 while
Of the vertical conveyor 2 into the rising material receiving chamber.

Granules at the outer diameter of the screen leads exit these screen leads tangentially. Further, the powder particles existing inside and supported by the powder particles on the outer side move on the screw leads radially outward as soon as the powder particles on the outer side jump out. Since these particles reach not only the peripheral velocity but also the radial velocity component when exiting the screw lead, these particles that have reached the inside of the screw more coincide with the tangent line in the imaginary circle. The circle has a diameter slightly smaller than the diameter of the screw tube.

In order to allow the granules 12 to flow unhindered into the area of the rising chamber, the bottom 8 of the material receiving chamber is opposite to the support belt 11 and is free to scatter powder. It is inclined upwards at an angle resulting from the geometrical addition of the velocity vectors of the granules 13 and the second vertical conveyor 2. As a result, the particles of the powder jet 13 jump into the material receiving chamber bottoms 8 of the vertical conveyor 2 parallel to the surface of these material receiving chamber bottoms and into the inlet area of the material receiving chambers.

As it progresses further towards the support belt 11, the upper part of the bottom of the material receiving chamber is increasingly curved upwards. In this case, the granular material 12 forms an oblique angle and scatters to the innermost part of the chamber. The flying trajectory is laterally limited by a hit point 10 caused by a defined tangential direction. Granule 1
2 is accelerated upward in the path towards the support belt 11 and the horizontal velocity component of these particles is decelerated to zero by friction at the bottom 8 of the material receiving chamber.

The filling of the chamber of the second vertical conveyor 2 can best be seen in FIG. This figure shows the second vertical conveyor 2
The movement of the particles 12 of the granular material jet in the bottom 8 of the material receiving chamber and the stationary coordinate system is shown. Simplified, granular material 12
It is assumed that the particles are scattered on a horizontal straight line and the speeds of the granular material 12 and the vertical conveyor 2 are the same. Therefore, the material receiving chamber bottom 8 is made inclined with respect to the horizontal. If the speed of the vertical conveyor 2 is greater than the speed of dispersion of the granules 12, the material receiving chamber bottom 8 is provided at a steeper angle, and vice versa.

On entry into the area of the rising material receiving chamber bottom 8, both granules 12 are in A.

At B, both particles 12 are separated by a distance s ₁
Is advanced. In this example, the material receiving chamber bottom 8 has moved upwards by the same size. These powder particles 12 are arranged at the same distance from the upper surface or the lower surface of the material receiving chamber bottom 8. This is because in the first part, the material receiving chamber bottom 8 is inclined at an angle formed by the sum of the vectors of the scattering speed of the particles and the velocity of the vertical conveyor 2. After that, the angle of the upper surface of the material receiving chamber bottom 8 changes, and this angle becomes more gradual. The material receiving chamber bottom 8 is formed by curving upwardly. After B, the upper granules 12 are reached by the material receiving chamber bottom 8 and are accelerated upwards by the material receiving chamber bottom, while the granules are scattered with their previous horizontal velocity component. Try to continue. Due to the increasing pressure on the material receiving chamber bottom 8, the horizontal velocity component is decelerated more strongly the stronger the upward bending of the material receiving chamber bottom 8.

The area of upward curvature must be provided to protect against wear. This is, for example, a) the entire material receiving chamber bottom 8 is made of particularly wear-resistant rubber, b) the material receiving chamber bottom 8 is made of another wear-resistant material, for example a special steel plate, and c) the material receiving chamber bottom 8 It consists of rubber and is made of vulcanized steel in the region of upward curvature.

The same filling process is shown in FIG.
It is shown in a coordinate system that moves with. This illustration shows
It is particularly suitable for determining the shape of the bottom 8 of the material receiving chamber.

It can be imagined that FIG. 3 was taken with the bottom camera. Flash opening occurred 3 times while the lens shutter of the camera was open.

FIG. 4 was created because the camera was mounted on a second vertical conveyor and the lens shutter was open while the material receiving chamber of the support belt of the second vertical conveyor was being filled. And

[Brief description of drawings]

FIG. 1 is a partial view of a material receiving mechanism and a lower portion of a first vertical conveyor, taking a ship unloading device for continuous transportation as an example.

FIG. 2 is a horizontal cross-sectional view showing the supply of the granular material from the first vertical conveyor to the second vertical conveyor.

FIG. 3 is an illustration of the bottom of the material receiving chamber of the second vertical conveyor and the granules in a stationary coordinate system at three points in time that are short in duration with each other.

FIG. 4 is a diagram showing a scattering direction of powder particles in a coordinate system that moves together with a second vertical conveyor.

[Explanation of symbols]

 1, 2 Vertical conveyor 3 Screen tube 5 Outlet 6 Transition passage 7 Inlet 8 Material receiving chamber bottom 9 Material receiving chamber side wall 10 Per point 14 Virtual circle

Claims (4)

[Claims] 1. A material receiving mechanism and a screw conveyor (first vertical conveyor) which is enclosed in the material receiving mechanism and extends upward and rotates about a vertical axis.
And this screw conveyor supplies powder particles in a substantially horizontal free-spraying jet to a belt conveyor (second vertical conveyor) which is arranged vertically to the loading device and has a material receiving chamber. In a continuous transport and loading device for the body between the outlet (5) in the screw tube (3) of the first vertical conveyor (1) and the inlet (7) in the second vertical conveyor (2) , A transition passage (6) having a rectangular cross section is arranged at a certain height, and the width of the transition passage (6) and the inlet (7) is the screw pipe (3) and the diameter of this screw pipe (3). Bounded by the tangent to the virtual circle (14) reaching 80 to 90% of the inner diameter of 3),
Characterized in that the material receiving chambers (8, 9) of the vertical conveyor (2) of (1) have a width determined by the spacing of the contact points (10) of the tangents at the innermost of these chambers, Continuous transportation and loading device for powder and granular material. 2. A second vertical conveyor (2) comprising a support roller-guided flat support belt (11) made of rubber or rubber-like material with longitudinal and transverse reinforcements, which support belt The bottom of the material receiving chamber with uniform spacing (8)
And a lateral material receiving chamber side wall (9) arranged at right angles to the surface of the support belt, continuous transport loading for granules according to claim 1. apparatus. 3. The bottom of the material receiving chamber (8) coincides with the moving direction of the granules (12) in the coordinate system moving with the second vertical conveyor (2) in the inflow range of the granules. 1 and 2, characterized in that it is inclined at such an angle that the surface of the bottom of the material receiving chamber (8) is curved upward in the further course to the innermost part of the material receiving chamber. The continuous transportation and loading device for powder and granular material according to one of the above. 4. A continuous conveying and loading device for granules according to claim 3, characterized in that the material receiving chamber bottom (8) has an anti-wear device in the region of the upward curve.